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Second differences are 2,2,1,2,1,1,2,1,1,1,2,1,1,1,1,2,1,1,1,1,1,2,.. (A035214).
2

%I #6 Oct 28 2013 12:07:27

%S 4,1,0,1,3,7,12,18,26,35,45,56,69,83,98,114,131,150,170,191,213,236,

%T 260,286,313,341,370,400,431,463,497,532,568,605,643,682,722,763,806,

%U 850,895,941,988,1036,1085,1135

%N Second differences are 2,2,1,2,1,1,2,1,1,1,2,1,1,1,1,2,1,1,1,1,1,2,.. (A035214).

%Y Different from A005228. Cf. A035254.

%K nonn,easy

%O 0,1

%A Robet Bronson (bob(AT)bronsons.com)